Typewriting machine



Feb. 5 1924. 1,482,733

G. W. CAMPBELL TYPEWRITING MACHINE Filed Septl ll. 1929 ?atented Feb. 5, 1924.

'UNITED STAT-Es PATENT OFFICE.

GEORGE W. CAMPBELL, 01E' HABTFQRD, CONNECTICUT, ASSIGNOR T0 UNDERWOD TYPEWRITER COMPANY, OF NEW YORK, N. lY., A CORPORATIONOF DELAWARE.

TYPEWRITING MACHINE.

Application led September 11, 1920. Serial No. 409,584.

T 0 all 'w hom t may concern' Be it known that I, GEORGE W. CAMPBELL, a citizen of the United States, residing in Hartford, in the county ofHartford 4and State of Connecticut,have invented certain new and kuseful Improvements in Typewriting Machines,of whichth'e following is a specification.

This invention relates to vfront-strike typewriting machines, and has for one of'its objects the provision of improved means to permit the space-bar to operate, to feed the carriage, without vibrating the ribbon.

Other features and advantages will hereinafter appear.

The accompanying drawing is a perspective view of an Underwood portable typewriting machine, disclosed in my Patent, No. 1,332,972, dated March 9, 1920, showing m invention'applied thereto.

ey-levers 1 swing type-bars 2, having types 3, 4 and 5, upwardly and rearwardly to print against the front side of a platen 6,

rotatably supported on a carriage 7. lThe carriage travels back and forthl on a front rail 8 and a rear rail 10 of a case-shiftframe 11, comprising ends 12, only one of which is shown herein. Said case-shiftframe is actuable to shift the platen `6 to enable the types 3, 4 or 5 to print, as shown and described in the patent to lVilliam A. Dobson, No. 1,335,956, dated April 6, 1,920. At each typestroke,the usual ribbon (not shown) may be operated to bring it into the path of the printing type.V For this purpose, a universal bar 13, which may be operated by the 4key-levers 1, has connected thereto ribbon-vibrating mechanism comprising a link 13a, and which may be like that disclosed in my patent application, No. 240,000, filed June 14, 1918.

To feed the carriage 7 at each type-strokel the universal bar 13 is secured to a shaft 14 yto rock the latter, so as to cause an upwardly-extending arm 15 thereon to engage the endl 16 of a dog-rocker 17, to swing said dog-rocker about its pivot 18 and against the tension of a return-spring (not shown). The dog-rocker 17 is provided with a loose dog 2O and a fixed dogv 21 which are thus vibrated between the teeth 22 of an escapement-wheel 23 connected with a pinion 24 meshing with a feed-rack 25 on the typewriter-carriage to feed the carriage in the well-known manner. A spring-drum (not v shown)"may urge the carriage in a letterspace direction. The escapement-mechanism, including the dog-rocker 17 and the escapement-wheel 23, is supported on the shift-frame 11 and is shiftable therewith, when the platen is shifted to print with the types 4 or 5, and relatively to the arm 15 ofthe rock-shaft 14 which is pivotally supported in brackets 26 on a cross-bar 27 forming part of the main frame of the machine. It willbe seen that the connection between the arm 15 and the end 16 of the dog-rocker 17 is such as to permit relative movement when the platen is shifted.

From the foregoing, it will be understood that the ribbon is vibrated, and the carriage is fed, by the universaly bar'which may be actuated by any one of the type-keys.

It is sometimes desirable to leave the ribbon at rest when thecarriage is fed, as, for instance, when the space-bar 28 is operated. For this purpose, the space-bar 28, which is supported at the forward ends of two .arms 30, secured to a shaft 31, may be depressed to rock the shaft 31 to swing an upwardlyextending arm 32 against thel tension of a spring 33, to draw an adjustable link 34 forwardly, to rock an actuator 35 pivoted at 36 yon a bracket 37 secured to the cross-bar 27 of the machine-frame. an upward extension 38 with a finger 40 to engage behind the end 16 of the dog-rocker 17 to swing the latter aboutits pivot or axis 18 to operate the escapementmechanism as hereinbefore described. Since there is an independent connection, including the actuator 35, bet-Ween the dog-rocker17 and the space-bar 28, the carriage may be fed by the space-*bar without'vibrating the ribbon.

It will be Seen that the actuator 35 is in the nature of a lever of the third order, that its pivot or axis 36 is at right angles to the axis 18 of the dog-rocker, and that the connection between the actuator 35 and the dog-rocker 17 is such as' to permit a relative movement during case-Shifting of the platen without changing the leverage of the actuator 'and the dog-rocker. Any suitable means may be provided to limit the returnmovement of the space-bar and its connected parts.

The actuator 35 has Variations may be resorted to Within the scope of the invention, and portions of the improvements may be used Without others.

Having thus described my invention, I claim:

- 1. In a typewriting machine, the combination cfa case-shift frame, a movable carriage, printing devices, a universal bar independent of said case-shift frame and ac-A tuable by said printing devices, ribbonvibrating mechanism connected tofsaiduniversal bar, carriage-escapement mechanism including a dog-rocker mounted on, and movable with, said case-shift frame to be actuated by said universal-bar, a space-bar, a link connected to said space-bar, and a pivoted element to engage said dog-rocker and actuate the latter to feed said carriage Without disturbing said universal bar and said connected ribbon-vibrating mechanism.k

2. In a typeivriting machine ther combination of a case-shift frameai movable carriage, printing devices, a universalbar independent or' said case-shift tra-me and actuable by said printing devices, ribbonvibrating mechanism connected to said universal bar, carriage-escapement mechanism including a dog-rocker mounted on, and movable with, said case-shift frame, an actuator to be operated to engage said dogrocker directly and operable by said universal bar, a space-bar, and a separate connection between said space-bar and said dog-rocker, said connection comprising a second actuator to engage said dog-rocker directly to enable the latter to be operated independently of saidy ribbon -vibrating mechanism.

3.k Ina typewriting machine, the combination ofa case-shift frame, a movable carriage, a platen on said carriage, printing devices, a universal bar independent of said kcase-shift frame and actuable by said printing devices, ribbon-vibrating mechanism connected to said universal bar, carriage-escapement mechanism including a dog-rocker mounted on, and movable with, said caseshift frame, an actuator to be operated to engage said dog-rocker directly and operable by said universal bar, a space-bar, and a separate connection between said space-bar and said dog-rocker, said connection comprising a second actuatorto engage said dog-rocker to operate the latter independently Vof said ribbon-vibrating mechanism, the connection between said actuators and' said dog-rocker being such as to permit said dog-rocker to be shifted relatively to'said actuators without varying the distance from the pivot of said dog-rocker to the points of contact ofsaid actuators.

4. In atypewriting machine, the combination of a carriage, ribbon-vibrating mechanism, carriage-escapement mechanism comprising a dog-rocker, a pivoted actuator to engage said dog-rocker, a space-bar, and a link connected between said actuator and said space-bar, the free end ot said actuator engaging directly with said dog-rocker to operatethe latter, to feed said carriage Without actuating said ribbon-vibrating mechanism.

5. In a typewriting machine, the combination of a carriage, ribbon-vibrating mechanism, carriage-escapement mechanism comprising a dog-rocker, a lever of the third order to actuate said dog-rocker, a spacebar, and `a link connected to said lever and said space-bar, the upper free end of said lever engagingV directly with said dog-rocker to operate the latter, to feed said-carriage Without actuating said ribbon-vibrating mechanism.

6. In a typewriting machine, the combination of a carriage, carriage-escapement mechanism comprising an escapen'ient Wheel, tivo pivoted co-operating elements, namely, a dogrocker and an actuator, the axes of said co-cperating elements being at right' angles to each other, so as to permit relative shifting movement therebetween Without changing the leverages, printing devices, a universal bar-operableby said printing devices to operate said dog-rocker through the medium of said actuator, a space-bar, a second actuator, and a separate connection between the space-bar and said second actuator to operate the dog-rocker independently of the universal bar.

7. In a typewriting machine, the combination of a carriage, carriage-escapement mechanism comprising an escapement Wheel, a main frame, a case-shit-frame, two pivoted co-operating elements, namely, a dog-rocker and-an actuator, one of said co-operating elements being carried by the main frame, the other co-operating element being carried by the case-shift-frame, the axes of said co-operating elements being. at right angles to each other, so as to permit a relative shifting movement therebetweeny Without changing the leverages, When the case-shitt-frame is actuated, printing devices, a universal bar operable by said printing devices to operate said dogrocker through the medium of said actuator, a space-bar, a second actuator, and a separate connection between said space-bar and said second actuator to operate said dogrocker independently of said universal bar.

GEORGE W. CAMPBELL.

Witnesses:

L. M. DoBsoN, E. A. DONOVAN. 

